plugins: Use emit_before_op for PLUGIN_GEN_FROM_MEM Introduce a new plugin_mem_cb op to hold the address temp and meminfo computed by tcg-op-ldst.c. Because this now has its own opcode, we no longer need PLUGIN_GEN_FROM_MEM. Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>